Jeremie is working on the materialization program, and Odd accidentally finds it, but it can be used only one time. Jeremie wants to materialize Aelita, but realizes that preparations need to be made. That night, X.A.N.A. possesses two bulldozers and starts to destroy the factory. Odd and Yumi go into Lyoko where she falls into a virtual black hole. In order to save Yumi's life, Jeremie has to choose between either materializing her or Aelita.